CN105577595B - Common mode inhibition device based on difference transmission lines - Google Patents
Common mode inhibition device based on difference transmission lines Download PDFInfo
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- CN105577595B CN105577595B CN201510732910.3A CN201510732910A CN105577595B CN 105577595 B CN105577595 B CN 105577595B CN 201510732910 A CN201510732910 A CN 201510732910A CN 105577595 B CN105577595 B CN 105577595B
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- conducting wire
- transmission lines
- common mode
- esd
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
- H04L25/085—Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
- H04L25/0276—Arrangements for coupling common mode signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Dc Digital Transmission (AREA)
- Filters And Equalizers (AREA)
Abstract
This disclosure relates to a kind of common mode inhibition device based on difference transmission lines.Specifically, a kind of common mode inhibition device for eliminating the common-mode noise in high frequency differential data transmission system and associated method are provided, common mode inhibition device includes being configured as difference transmission lines that the length of data is transmitted between source and load, winding.The difference transmission lines include the first conducting wire and the second conducting wire, the first conducting wire and the second lead inductance and capacitively coupled and be laterally aligned with each other or vertically-aligned.In addition, the difference transmission lines match for differential signal and are directed to common-mode noise and mismatch.
Description
Technical field
This disclosure relates to differential data transmission system, and more particularly to a kind of common mode inhibition device associated therewith and
A method of for inhibiting common-mode noise.
Background technique
In recent years, along with the diversification of electronic equipment, the demand of high frequency signal transmission also increased.Difference
Dividing transmission/signaling is preferred method for many high-frequency apparatus.Difference signaling is a kind of using in such as two pairings companies
The complementary signal sent on line and the method for electronically transmitting information, above-mentioned two pairing lines are referred to as differential pair.Difference
Point signaling is also the primary selection of low power RF interconnection, this is because it is by providing double signal pendulum for given supply voltage
It moves and provides the superpower immunity for noise.When differential transfer is used for the transmission of high-frequency signal, external electrical is influenced
The electromagnetic interference of equipment can be reduced.In addition, differential transfer can reduce the shadow of the electromagnetic interference from external electronic device
It rings.However, differential data transmission line/bus signal integrity may be damaged due to common-mode noise.Common-mode noise can be by
The radiation of system itself or coupling is generated.
Detailed description of the invention
Hereinafter, the disclosure will be explained further below and will be described using specific example embodiment with reference to attached drawing.
Fig. 1 shows the schematic diagram of the typical differential data Transmission system with common mode inhibition device；
Fig. 2 shows the schematic diagrames for the differential data transmission system protected with common mode inhibition device and static discharge (ESD)；
Fig. 3 shows the common mode inhibition including long, winding difference transmission lines of one embodiment according to the disclosure
The schematic diagram of device；
Fig. 4 A shows the common mode inhibition including long, winding difference transmission lines of one embodiment according to the disclosure
The layout of device；
Fig. 4 B shows the decomposition view of the difference transmission lines of Fig. 4 A；
Fig. 5 A-5B shows the schematic illustration of the common mode inhibition device in semiconductor substrate；
Fig. 6 A-6D shows the emulation knot of differential mode and common mode according to the common mode inhibition device of one embodiment of the disclosure
Fruit；
Fig. 7 A shows the signal of the common mode inhibition device with esd protection circuit of one embodiment according to the disclosure
Figure；
Fig. 7 B shows the layout of the common mode inhibition device with esd protection circuit of one embodiment according to the disclosure；
Fig. 8 A-8C shows the differential mode of the common mode inhibition device with ESD protection of one embodiment according to the disclosure
Simulation result；
Fig. 8 D-8F shows the common mode of the common mode inhibition device with ESD protection of one embodiment according to the disclosure
Simulation result；
Fig. 9 A and Fig. 9 B show according to one embodiment of the disclosure for 5GB/s signal and 10GB/s signal when
Domain analysis；
Figure 10 shows the diagram according to one embodiment of the disclosure to the common-mode noise in differential data transmission system
The flow chart of the method inhibited；
Figure 11 shows the diagram according to one embodiment of the disclosure for the common mode inhibition including difference transmission lines
The flow chart that device is tuned to realize the method for common mode noise rejection.
Specific embodiment
The disclosure is described with reference to the drawings, wherein similarly being wanted using the reference of same appended drawing reference always
Element, and wherein illustrated structure and equipment are not necessarily drawn to scale.
This disclosure relates to a kind of device and method for being inhibited to the common-mode noise in differential data transmission system.
Differential data transmission system uses difference signaling, and wherein use of information is sent on two pairing lines for being referred to as differential pair
Two complementary signals and transmission is conducted electrically.In addition to carrying useful information differential signal other than, the differential pair by
The influence of common-mode noise.Common-mode noise is conducted in same direction on two lines, and due to its do not carry information but
It is not expected that the signal seen.Common-mode noise is played the part of for generating radio frequency interference (RFI) in the communication system using differential transfer
Key player is drilled, therefore eliminates common-mode noise and is important.In addition, differential data transmission system is also by ESD (static discharge)
The influence of impact, this needs are avoided by.
In one embodiment of the present disclosure, a kind of differential data transmission system includes being configured as transmitting to include data
The source of differential signal, and be configured as receiving the load of the differential signal.The system further comprises common mode inhibition device, packet
Include be configured as from the source to the load transmit the differential signal length, winding difference transmission lines.
In another embodiment of the disclosure, one kind is for eliminating common-mode noise in high frequency differential data transmission system
Common mode inhibition device, including be configured as between source and load transmit data length difference transmission lines.The difference transmission lines
Match for differential signal and is directed to common-mode noise and mismatches.In addition, the difference transmission lines are winding.Difference transmission lines
Show that the low return loss-in the case where at low signal reflection — that is, its place of outputting and inputting is matched at it.Good matching
Generally mean that the return of at least -20dB to -30dB is lost.
In another embodiment of the disclosure, disclose a kind of for inhibiting the common mode in differential data transmission system to make an uproar
The method of sound.This method combines the common mode inhibition device in the differential data transmission system to be operated, which includes
Be configured as by signal from source be sent to load length, winding difference transmission lines.The difference transmission lines further comprise
One conducting wire and the second conducting wire, the first conducting wire and the second conducting wire are coupled and are laterally aligned with each other or vertically-aligned.This method
Difference transmission lines including matching the common mode inhibition device for differential signal, wherein matching the difference transmission lines for differential signal
It is tuned including the differential impedance to the difference transmission lines and is matched with the impedance with load and source.This method further comprises
For common-mode noise the difference transmission lines of the common mode inhibition device are mismatched, wherein making difference transmission lines for common-mode noise
Mismatch includes the inductance for increasing the difference transmission lines for common-mode signal.
The elimination of common-mode noise in differential data transmission system realized by common mode inhibition device, wherein the common mode inhibition
Device is configured as providing Low ESR for difference mode signal and provides the equipment of high impedance for common-mode noise.In conventional system
In, the design of the common mode inhibition device based on common mode choke and implement.Common mode choke is made of pairs of coupling inductor,
They provide low inductance for difference mode signal and provide high impedance for common-mode noise.The key factor of common mode choke is two
Magnetic couplings between a inductor.The magnetic couplings are higher, common mode inhibition and better for the impedance matching of differential mode.
In one embodiment, which includes the magnetic core of two conducting wires with winding thereon, above-mentioned
Two conducting wire the number of turns having the same.In the case where difference mode signal, flow through the electric current of this two conducting wires with opposite phase and
Cancel out each other, therefore do not generate magnetic flux, and the impedance of two conducting wires can remain it is low.Therefore, differential signal can
It easily passes through.In the case where common-mode signal, the electric current for flowing through this two conducting wires has same phase, therefore generates in magnet
Magnetic flux, and the impedance of this two conducting wires is got higher, so that common-mode signal is difficult to pass through.Therefore, common-mode signal decays.So
And the common mode choke is needed using the material (for example, magnetic mold, ferrite inductance) with ferromagnetic characteristic, this makes it
It is bulky and be not suitable for frequency applications.In addition, to go out high diversity (non-constant for certain common mode choke Technological expressions
Group delay), this declines time domain performance, so that its high-speed interface application for being not particularly suited for such as USB, HDMI.This
Outside, in the conventional system, ESD protection is the non-silicon solution based on such as varistor or spark gap etc, they have
The excessively high clamp voltage for sensory system.
In order to provide a kind of common mode inhibition device suitable for frequency applications, described in the disclosure a kind of including long, volume
Around transmission line common mode inhibition device.In some embodiments, the length, winding transmission line is instead of conventional difference data
Common mode choke used in Transmission system.In the disclosure, the lump including the common mode choke with coupling inductor
System is substituted by the distributed system of transmission line including length, winding.The lumped-element model is only in LcIt is effective when < < λ,
Wherein LcThe operative wavelength of the physical length of indication circuit and λ then indication circuit.In high frequency, pass through the wavelength of the signal of the circuit
Become suitable with the physical size of circuit element, this makes lumped model and inaccurate.Therefore, transmission line is used in the disclosure
Coupling inductor is substituted, so that common mode inhibition device is suitable for frequency applications.For available distributed model, transmission line
Length should be at least more than the wavelength X of the signal transmitted by the circuit for the scheduled frequency range of differential signal
1/10th.The scheduled frequency range includes the physics ruler wherein become by the wavelength of the signal of the circuit with the circuit element
Very little comparable frequency.In one example, the length of difference transmission lines is 7mm, corresponds to λ/10 in about 2.5GHz.At this
Frequency is hereinafter, the description of lamped element is sufficient and our difference transmission lines can be considered as to a pair of simple coupling electricity
Sensor.However, our suppressor will work in the up to frequency of 10GHz, wherein the physical length of 7mm corresponds to 0.4 λ
(>λ/10).Therefore, we are described using distributed element and are directed to the frequency range higher than 2.5GHz using transmission line theory
Accurate Model is carried out to our suppressor.Therefore, in this example, long for the scheduled frequency range of 2.5GHz -10GHz
The difference transmission lines that degree is 7mm can common mode inhibition device to us carry out Accurate Model.In addition, in this embodiment, utilizing
Long, winding common mode transmission line substitution common mode choke eliminates the use of ferrimagnet.
Fig. 1 depicts differential data transmission system 100, with source circuit 101, load circuit 103, and is connected to source
Common mode inhibition device 102 between circuit 101 and load circuit 103.Source circuit 101 is configured with two coupling lines with difference
Point mode sends information, and load circuit 103 is configured as receiving the differential signal as transmitted by source circuit 101.At one
In embodiment, common mode inhibition device 102 includes long, winding difference transmission lines.Common mode inhibition device 102 is configured as passing difference
Common-mode noise on defeated line is inhibited.Differential data transmission system 100 can be any high-speed data of such as HDMI, USB
A part of communication system.
Other than common-mode noise, differential data transmission system is influenced by ESD impact.Fig. 2 is depicted to be protected with ESD
The differential data transmission system 200 of protection circuit.System 200 includes source circuit 201, load circuit 204 and common mode inhibition device
203.In addition, system 200 includes the esd protection circuit 202 for being connected to the input pin of common mode inhibition device 203, it is configured as
Protect differential data transmission system 200 from the influence of ESD impact.
Fig. 3 shows specific embodiment, and wherein common mode inhibition device 300 includes long, winding difference transmission lines.The difference
Point transmission line includes the first conducting wire 301 and the second conducting wire 302, they are inductively and capacitively coupled to each other and relative to each other
It is vertically-aligned.The route intentionally (inductively and capacitively) is coupled to obtain desired differential impedance Z0diff=√ L/
C.The coupling by between transmission line capacitor C and their inductance L provide desired impedance Z0diffThe side of=√ L/C
Formula is realized to adjust the layout of transmission line.In other embodiments, the first conducting wire 301 and the second conducting wire 302 can be relative to
It is laterally aligned with each other.In addition, the difference transmission lines include respectively first in the input side of the first conducting wire 301 and the second conducting wire 302
Input pin 303 and the second input pin 304.In some embodiments, input pin 303 and 304 is connected to ESD protection electricity
Road, and in other embodiments, input pin 303 and 304 is connected directly to source circuit.In addition, the difference transmission lines are distinguished
It include the first output pin 305 and the second output pin 306 at the outlet side of the first conducting wire 301 and the second conducting wire 302.Output
Pin 305 and 306 is connected to load circuit.
In one embodiment, Fig. 4 A shows the layout of common mode inhibition device 400 comprising the first conducting wire 401 and second
Conducting wire 402, they are inductively coupled to each other and are aligned laterally relative to each other.In addition, the first conducting wire 401 includes first defeated
Enter pin 403 and the first output pin 405, and the second conducting wire 402 then includes the second input pin 404 and the second output pin
406.Common mode inhibition device 400 is configured as providing Low ESR for difference mode signal and provides high impedance for common-mode noise.It is special
Not in this embodiment, common mode inhibition device 400 is matched and needle with the first conducting wire 401 and the second conducting wire 402 for differential signal
Then and unmatched mode configures to common-mode signal.In order to provide impedance matching, the difference of difference transmission lines in differential mode
Impedance is tuned to match with load and source impedance, so that differential signal can't see the discontinuity of impedance.The input of equipment/
Signal at output is not it has to be observed that impedance identical with the transmission line that it is traveled over, that is, have resistive discontinuity.It is negative
It carries and source impedance is usually equal, so that they can be referred to as system impedance.In one embodiment, differential impedance quilt
It is tuned as being equal to 100 ohm, it however in other embodiments, can be different and be load and source impedance (that is, system
Impedance) function.It in one embodiment, is by changing the first conducting wire 401 and the second conducting wire 402 to the tuning of differential impedance
Section and/or change the distance between the first conducting wire 401 and the second conducting wire 402 to realize.
Once realizing difference matching, transmission line must just be mismatched for common-mode noise.So that difference transmission lines are altogether
Mismatch in mould is realized by the impedance for increasing difference transmission lines for common-mode signal.Especially in this embodiment, poor
The impedance of transmission line is divided to be increased to increase impedance for common-mode signal.Increase the inductance of difference transmission lines for common-mode signal
Length including increasing the difference transmission lines including the first conducting wire 401 and the second conducting wire 402.Briefly, however increase difference to pass
The length of defeated line increases it also for the resistance of differential signal, this is it is not expected that seeing.In order to increase difference
The inductance of transmission line and do not significantly increase resistance, difference transmission lines are windings, therefore form the volume with multiple windings
Around difference transmission lines.Winding transmission line increases overall inductance and therefore the transmission line is directed to common-mode signal just as big electricity
Sensor works like that.Inductance increases with the increase of winding quantity in coil.
What Fig. 4 B showed Fig. 4 A includes the decomposition view of the common mode inhibition device of long, winding difference transmission lines.As long as
Coupling between the different segmentations of difference transmission lines be it is insignificant, winding difference transmission lines just have no effect on differential signal.Separately
On the one hand, in order to for common-mode noise offer high impedance, it is necessary to so that the coupling in coil between adjacent winding is very high.Example
Such as, the conducting wire 401 and 402 in Fig. 4 A forms a winding.Fig. 4 B shows two adjacent windings, the common mode inhibition device of Fig. 4 A
400 winding 1 and winding 2.Distance 409 indicates the distance between winding 1 and winding 2.Winding 1 includes common mode inhibition device 400
First segmentation 401a of the first conducting wire 401 and the first segmentation 402a of the second conducting wire 402.Similarly, winding 2 includes common mode inhibition
Second segmentation 401b of the first conducting wire 401 of device 400 and the second segmentation 402b of the second conducting wire 402.In order to be directed to common-mode signal
There is provided high impedance and have no effect on differential signal, in one embodiment so that the distance between winding 1 and 2 409 respectively with around
The distance between 1 and two conducting wires of winding 2 407 and 408 is organized to compare relatively more greatly.By reducing the distance between winding 409,
Common code impedance is increased for we and to make structure smaller (positive effect), but also increase winding differential lines it
Between coupling (counter productive).Field electromagnetism (EM) in differential mode is defined between two conducting wires of winding.If 407 and 409
, then will be without EM interaction between the winding in differential mode compared to smaller, this is desired.On the other hand, if we make 409
It is excessive, then it reduces common code impedance and increases the size of structure, this is also not expect to see.It is emulated by using EM
Device optimizes the layout can find tradeoff between 407 and 409.
Fig. 5 A and 5B show the common mode inhibition device 500 of including the length in semiconductor substrate, winding difference transmission lines.
Fig. 5 A shows one embodiment, and wherein common mode inhibition device 500 includes the first diatom 502 and the second conducting wire 504, identical as Fig. 3,
They inductively and capacitively carry out coupling and being aligned vertically each other.502a and 502b is two of the first conducting wire 502
Difference segmentation, and 504a and 504b are two different segmentations of the second conducting wire 504.In addition, Fig. 5 A show it is two adjacent
Winding, winding 1 and winding 2, wherein winding 1 include the first conducting wire 502 first segmentation 502a and the second conducting wire 504 first
It is segmented 504a, and winding 2 includes the second segmentation 502b of the first conducting wire 502 and the second segmentation 504b of the second conducting wire 504.The
One conducting wire 502 is formed in dielectric layer 3, and the second conducting wire 504 is formed in dielectric layer 2.It is desired in order to realize
Common mode inhibition and have no effect on differential signal so that 506 to the first conducting wire 502 of the distance between adjacent winding and the second conducting wire
The distance between 504 508 is bigger.
Fig. 5 B shows another embodiment, and wherein common mode inhibition device 500 includes the first conducting wire 522 and the second conducting wire 524,
Similar with Fig. 4 A, they inductively and are capacitively coupled and are laterally aligned with each other.522a and 522b is first to lead
The different segmentations of two of line 522, and 524a and 524b are two different segmentations of the second conducting wire 524.In addition, Fig. 5 B is shown
Two adjacent windings, winding 1 and winding 2, wherein winding 1 includes the first segmentation 522a and the second conducting wire of the first conducting wire 522
524 the first segmentation 524a, and second point of second segmentation 522b and second conducting wire 524 of the winding 2 including the first conducting wire 522
Section 524b.First conducting wire 522 and the second conducting wire 524 are formed in identical dielectric layer 2.In order to realize desired common mode suppression
It makes and has no effect on differential signal, so that between 526 to the first conducting wire 522 of the distance between adjacent winding and the second conducting wire 524
Distance 528 it is bigger.
Fig. 6 A-6D shows the simulation result that common mode inhibition device is directed to differential mode and common mode, wherein the difference of difference transmission lines
Impedance is designed to the system impedance of 100 ohm of matching.Each chart shows the S parameter coefficient in 0-25GHz frequency range
Variation.Scattering parameter or S parameter describe linear electrical network various stable states caused by experience electric signal when stimulating
Electrical representation.Particularly, S parameter gives the relationship between incident power and reflection power.For both-end jaws equipment, deposit
In four S parameters S11, S21, S12 and S22.S11 and S22 is positive and retrodirective reflection coefficient, and S12 and S21 indicates positive and passes
Defeated coefficient and reverse transmission coefficient.From Fig. 6 A and 6D, it can be seen that for the frequency between 0GHz and 15GHz, believe for common mode
Numbers 601 righting reflex coefficient S 11 and be 0dB (that is, total reflection), this table for the retrodirective reflection coefficient S 22 of common-mode signal 607
Show that there are very high reflections for common-mode signal, and is directed to the righting reflex coefficient S 11 of difference mode signal 602 and is directed to differential mode
The retrodirective reflection coefficient S 22 of signal 608 is -20dB, this indicates that there are low-down reflections for difference mode signal.In addition, from figure
6B and 6C find out, for the frequency range of 0-15GHz, positive transmission coefficient S12 for differential signal 603 and for poor
For the reverse transmission coefficient S21 of sub-signal 605 close to 0dB (that is, full transmission), this indicates that differential signal has extraordinary biography
It is defeated, and for the positive transmission coefficient S12 of common-mode signal 604 and far small for the reverse transmission coefficient S21 of common-mode signal 606
In 0dB, especially for being about -35dB for the frequency range of 10-15GHz, this indicates transmission of the common-mode signal by system
It is excessively poor.
The esd protection circuit 202 before common mode inhibition device 203 in Fig. 2 is due to the ESD diode inside 202
Parasitic capacitance and the characteristic of common mode inhibition device 203 is degenerated.Therefore, we must compensate these capacitors.Figure
7A is illustrated for providing ESD protection and the possibility PI compensated to the capacitor of the undesirable ESD diode of institute is electric
Road.ESD device ESD1-ESD4 in Fig. 7 A is used to model ESD diode.In one embodiment, Fig. 7 A describes
Esd protection circuit 701 associated with common mode suppressor 702 is connected to common mode inhibition by input pin 703 and 704
The input side of device 702.Esd protection circuit 701 is configured as the influence for protecting differential data transmission system from ESD impact.It is special
, be not connected to common mode inhibition device 702 the first input pin 703 and ground connection between the first ESD device 707 and be connected to
The second ESD device 708 between the second input pin 704 and ground connection of common mode inhibition device 702 is configured to supply ESD protection.
In some embodiments, esd protection circuit 701 further comprises the third being connected between the first input pin 703 and ground connection
ESD device 709, and the first ESD device 707 and third ESD device 709 are connected with inductance between the terminal of Earth Phase pair
711.Third ESD device 709 and inductance 711 provide compensation to the parasitic capacitance of the first ESD device 707.Esd protection circuit 701
It further include the 4th ESD device 710 being connected between the second input pin 704 and ground connection, and the second ESD device 708 and the
Four ESD devices 710 are connected with inductance 712 between the terminal of Earth Phase pair.4th ESD device 710 and inductance 712 are to second
The parasitic capacitance of ESD device 708 compensates.In fig. 7, ESD device 707 and 708 provides ESD protection, however other
In embodiment, ESD device 709 and 710 can be configured to supply ESD protection.In both embodiments, ESD protection is provided
ESD device must be ESD diode.In some embodiments, it is configured as providing the parasitic capacitance of the first ESD device 707
The third ESD device 709 of compensation is modeled as capacitor, has the electricity equal with the parasitic capacitance of the first ESD device 707
Hold.Similarly, the 4th ESD device 710 for being configured as providing the parasitic capacitance of the second ESD device 708 compensation is modeled as
Capacitor has the capacitor equal with the parasitic capacitance of the second ESD device 708.Fig. 7 B shows the protection of the ESD with Fig. 7 A
The layout of the common mode inhibition device of circuit.
Fig. 8 A, 8B and 8C show simulation result 801,802 and that the common mode inhibition device with ESD protection is directed to differential mode
803, wherein the differential impedance of difference transmission lines is designed to the system impedance of 100 ohm of matching.Each chart shows S parameter
Variation of the coefficient in the frequency range of 0-25GHz.The analysis of chart can be executed in a manner of being similar to Fig. 6 A-6D.Root
According to Fig. 8 A, 8B and 8C, Fig. 8 B of the variation of the positive transmission gain S12 of differential signal over a frequency range, institute are especially shown
It is clear that differential signal is transmitted with considerably less reflection by the system for the frequency range of 1-15GHz.So
And the performance has been degenerated when compared with the simulation result for the common mode inhibition device for not having ESD to protect in Fig. 6 A-6D, and
And this is because caused by the parasitics of ESD diode.Similarly, Fig. 8 D, 8E and 8F show the common mode with ESD protection
Suppressor is directed to the simulation result 804,805 and 806 of common mode, and wherein the differential impedance of the difference transmission lines is designed to match
100 ohm of system impedance.Each chart shows variation of the S parameter coefficient in the frequency range of 0-25GHz.According to figure
8D, 8E and 8F, especially show Fig. 8 E of the variation of the positive transmission coefficient S12 of differential signal over a frequency range, and institute is clear
, have good common mode inhibition in the frequency range of 0-15GHz and very small amount of common-mode noise enter system it
In.
Fig. 9 A shows the time-domain analysis for 5GB/s signal according to an embodiment of the present disclosure.The graph show
The when domain representation of input signal 950 and output signal 952 in USB.Clear to be, output signal compared with input signal simultaneously
It is not distorted excessively, and this illustrates the systems to have extraordinary time domain performance.Similarly, Fig. 9 B is shown according to this public affairs
Open the time-domain analysis for 10GB/s signal of one embodiment.The graph show the input signals 960 and output letter in USB
Numbers 962 when domain representation.Clear to be that there is no excessive distortions compared with input signal for output signal, and this illustrates
The system has extraordinary time domain performance.
Figure 10 illustrates the method 1000 for inhibiting the common-mode noise in differential data transmission system.In frame 1002, mention
For first transmission line the first part of differential signal is transmitted to load from source, wherein the length of the first conducting wire is greater than by the
/ 10th of the wavelength for the differential signal that one conducting wire is transmitted.In frame 1004, the second conducting wire is provided with by the differential signal
Second part be transmitted to load from source, wherein the length of second conducting wire is greater than the differential signal that transmits by second transmission line
Wavelength 1/10th.In frame 1006, the first conducting wire and the second conducting wire are wound to form the winding with multiple windings
Difference transmission lines so that the distance between adjacent winding of the difference transmission lines of the winding be greater than the first conducting wire and the second conducting wire it
Between distance.
Figure 11 is illustrated for tuning difference transmission lines to realize the example embodiment of the method for common mode noise rejection.
Method 1100 is described herein with reference to the common mode inhibition device 300 of Fig. 3.
In frame 1101, the differential impedance of difference transmission lines is tuned so as to matching system impedance.That is, changing
The section and/or change the distance between the first conducting wire 301 and the second conducting wire 302 of first conducting wire 301 and the second conducting wire 302.?
The differential impedance of frame 1102, difference transmission lines is compared with system impedance.If differential impedance matches with system impedance
(1102 be yes), then this method is carried out to frame 1103, and otherwise (1102 be no), this method is back to frame 1101, again in which pair
The differential impedance of the difference transmission lines is tuned.In frame 1103, increase the inductance of differential transmission line pair common-mode signal.Namely
It says, increase includes the length of the difference transmission lines of the first conducting wire 301 and the second conducting wire 302 and subsequent difference transmission lines are rolled up
Around.In frame 1104, check that difference transmission lines are directed to the impedance of common-mode signal.If the impedance is high (1104 be yes), the party
Method is carried out to 1105, and wherein this method terminates.Otherwise (1104 be no), this method return frame 1103, wherein further increasing difference
Divide transmission line to the inductance of common-mode signal.
Although this method is illustrated and is described as a series of actions or event following, it will be appreciated that, institute
Such movement of diagram or the sequence of event are not really wanted in a limiting sense to explain.For example, be different from it is illustrated herein and/
Or those of description, some movements can be carried out with different order and/or be carried out simultaneously with other movements or event.In addition, simultaneously
Not all illustrated movement is all required for implementing the one or more aspects or embodiment of the disclosure.Moreover,
One or more movements depicted herein can be executed in one or more single movements and/or stage.
As highlighted above, should common mode inhibition device based on difference transmission lines and the prior art based on common mode choke
The common mode inhibition device of design is different compared to advantageously.Common mode inhibition device based on difference transmission lines without using magnetic material, because
The magnetic couplings of height are not needed for new design.In addition, being provided based on the suppressor newly conceived suitable for high-speed interface
Using the extraordinary time domain performance of (for example, USB, HDMI), and additionally provide being total to for very wide frequency band higher than 6GHz
Mode attenuation.In addition, being able to use based on the common mode inhibition device of difference transmission lines can be realized with technology.
Although being shown and described about one or more embodiments to the present invention, institute can be directed to
The example of diagram is changed and/or modifies without departing from spirit and scope of the appended claims.Particularly, about above
Various functions performed by described component or structure (component, equipment, circuit, system etc.), unless in addition indicated, it is no
The term (including the reference to " device ") for being then used to describe such component, which is intended to correspond to, executes the specified of described component
Any component or structure (for example, namely functional equivalent) of function, even if being not structurally equivalent to be schemed herein
The disclosed structure of the function is executed in the exemplary embodiments of the present invention shown.
Claims (20)
1. a kind of differential data transmission system, comprising:
Source circuit is configured as the differential signal that transmitting includes data；
Load circuit is configured as receiving the differential signal；And
The differential signal is sent to the length of the load circuit including being configured as by common mode inhibition device from the source circuit
, winding difference transmission lines；
Wherein described the first of the first conducting wire of the difference transmission lines and the section of the second conducting wire and the difference transmission lines is led
One or more differential impedances for being configured such that the difference transmission lines in the distance between line and second conducting wire
Match with system impedance；And
Wherein the length of the difference transmission lines and the arrangement of winding are configured such that the difference transmission lines are made an uproar for common mode
Sound simultaneously mismatches,
Wherein the length of the difference transmission lines is for the predetermined operation frequencies range of the differential signal at least more than passing through
/ 10th of the wavelength for the differential signal that difference transmission lines are transmitted are stated, are divided to be established for the common mode inhibition device
Cloth system model.
2. differential data transmission system according to claim 1, wherein first conducting wire and second lead inductance
Property and it is capacitively coupled to each other and vertically-aligned relative to each other.
3. differential data transmission system according to claim 1, wherein first conducting wire and second lead inductance
Property and it is capacitively coupled to each other and be aligned laterally relative to each other.
4. differential data transmission system according to claim 2, wherein in the difference transmission lines of the winding it is adjacent around
The distance between group is greater than the distance between first conducting wire of the difference transmission lines and described second conducting wire.
5. differential data transmission system according to claim 1 further comprises static discharge (ESD) protection circuit, institute
ESD protection circuit is stated to be attached to the first input pin of the common mode inhibition device and the second input pin and be configured
To provide the protection to ESD impact.
6. differential data transmission system according to claim 5, wherein the esd protection circuit is described total including being connected to
The first ESD device between first input pin and ground connection of mould suppressor, and it is connected to the common mode inhibition device
The second ESD device between second input pin and the ground connection, wherein first ESD device and the 2nd ESD
Device value having the same.
7. differential data transmission system according to claim 6, further comprise be connected to first input pin with
Third ESD device between the ground connection, wherein first ESD device and the third ESD device with the Earth Phase
Pair terminal between be connected with inductance, so that the parasitic capacitance to first ESD device compensates.
8. differential data transmission system according to claim 7, further comprise be connected to second input pin with
The 4th ESD device between the ground connection, wherein second ESD device and the 4th ESD device with the Earth Phase
Pair terminal between be connected with inductance, so that the parasitic capacitance to second ESD device compensates, and wherein described
Three ESD devices and the 4th ESD device value having the same.
9. a kind of for eliminating the common mode inhibition device of the common-mode noise in high frequency differential data transmission system, comprising:
Long, winding difference transmission lines, are configured as transmitting data between source circuit and load circuit；
Wherein described the first of the first conducting wire of the difference transmission lines and the section of the second conducting wire and the difference transmission lines is led
One or more differential impedances for being configured such that the difference transmission lines in the distance between line and second conducting wire
Match with system impedance；And
Wherein the length of the difference transmission lines and the arrangement of winding are configured such that the difference transmission lines are made an uproar for common mode
Sound simultaneously mismatches；
Wherein the length of the difference transmission lines is directed to the predetermined operation frequency of the signal transmitted by the difference transmission lines
Rate range at least more than the signal wavelength 1/10th, to establish distributed system mould for the common mode inhibition device
Type.
10. common mode inhibition device according to claim 9, wherein first conducting wire and second lead inductance and
It is capacitively coupled to each other and vertically-aligned relative to each other.
11. common mode inhibition device according to claim 9, wherein first conducting wire and second lead inductance and
It is capacitively coupled to each other and be aligned laterally relative to each other.
12. common mode inhibition device according to claim 9, wherein between adjacent winding in the difference transmission lines of the winding
Distance be greater than first conducting wire and the distance between described second conducting wire of the difference transmission lines.
13. common mode inhibition device according to claim 9 further comprises static discharge (ESD) protection circuit, the electrostatic
Discharge protection circuit is attached to the first input pin of the common mode inhibition device and the second input pin and is configured to supply
Protection to ESD impact.
14. common mode inhibition device according to claim 13, wherein the esd protection circuit includes being connected to the common mode suppression
The first ESD device between first input pin and ground connection of device processed, and it is connected to the described of the common mode inhibition device
The second ESD device between second input pin and the ground connection, wherein first ESD device and second ESD device
Value having the same.
15. common mode inhibition device according to claim 14, further comprise be connected to first input pin with it is described
Third ESD device between ground connection, wherein first ESD device and the third ESD device with the Earth Phase pair
Inductance is connected between terminal, so that the parasitic capacitance to first ESD device compensates.
16. common mode inhibition device according to claim 15, further comprise be connected to second input pin with it is described
The 4th ESD device between ground connection, wherein second ESD device and the 4th ESD device with the Earth Phase pair
Inductance is connected between terminal, so that the parasitic capacitance to second ESD device compensates, and the wherein third
ESD device and the 4th ESD device value having the same.
17. a kind of for inhibiting the method for the common-mode noise in differential data transmission system, comprising:
The first conducting wire is provided so that the first part of differential signal is transmitted to load circuit from source circuit；
The second conducting wire is provided so that the second part of the differential signal is transmitted to the load circuit from the source circuit；
Wind first conducting wire and second conducting wire；
The differential transfer of the winding with multiple windings is collectively formed in first conducting wire and second conducting wire that wherein wind
Line；
Wherein in the section and the distance between first conducting wire and second conducting wire of first conducting wire and the second conducting wire
One or more differential impedances for being configured such that the difference transmission lines match with system impedance；And
Wherein the length of the difference transmission lines and the arrangement of winding are configured such that the difference transmission lines are made an uproar for common mode
Sound simultaneously mismatches,
Wherein the distance between adjacent winding of the difference transmission lines of the winding is greater than first conducting wire and leads with described second
The distance between line；And
Wherein the length of the difference transmission lines of the winding is greater than for the predetermined operation frequencies range of the differential signal and passes through
/ 10th of the wavelength for the differential signal that the difference transmission lines of the winding are transmitted, so as to the difference for the winding
Transmission line is divided to establish Distributed System Model.
18. according to the method for claim 17, wherein first conducting wire and second lead inductance and capacitor
Property it is coupled to each other.
19. according to the method for claim 17, wherein first conducting wire and associated section of second conducting wire
Face area, and wherein the distance between first conducting wire and second conducting wire and first conducting wire and described second
The area of section of conducting wire is configured such that the differential impedance and system impedance phase of first conducting wire and second conducting wire
Match.
20. according to the method for claim 17, wherein the difference of the winding quantity of the difference transmission lines and the winding
The length of transmission line is configured such that the difference transmission lines of the winding for common-mode noise and mismatches.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/531,343 US9577852B2 (en) | 2014-11-03 | 2014-11-03 | Common-mode suppressor based on differential transmission line |
| US14/531,343 | 2014-11-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105577595A CN105577595A (en) | 2016-05-11 |
| CN105577595B true CN105577595B (en) | 2019-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510732910.3A Active CN105577595B (en) | 2014-11-03 | 2015-11-02 | Common mode inhibition device based on difference transmission lines |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9577852B2 (en) |
| KR (1) | KR101735957B1 (en) |
| CN (1) | CN105577595B (en) |
| DE (1) | DE102015118829A1 (en) |
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| JP6118304B2 (en) * | 2014-11-14 | 2017-04-19 | 株式会社オートネットワーク技術研究所 | Communication system and communication apparatus |
| WO2016150483A1 (en) * | 2015-03-23 | 2016-09-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Phase shifter |
| JP6314927B2 (en) * | 2015-07-22 | 2018-04-25 | 株式会社村田製作所 | Noise filter mounting structure |
| US10209328B2 (en) | 2016-05-27 | 2019-02-19 | General Electric Company | Systems and methods for common mode traps in MRI systems |
| US10379181B2 (en) * | 2016-05-27 | 2019-08-13 | General Electric Company | Systems and methods for common mode traps in MRI systems |
| WO2020121676A1 (en) * | 2018-12-14 | 2020-06-18 | ソニーセミコンダクタソリューションズ株式会社 | Transmission path |
| KR102242537B1 (en) * | 2019-03-21 | 2021-04-26 | 주식회사 홀로홀릭 | Data transmission apparatus and display apparatus comprising thereof |
| CN110492861B (en) * | 2019-08-15 | 2022-09-30 | 中国电子科技集团公司第五十五研究所 | Novel topological structure of GHz ultra wide band common mode noise suppression circuit |
| TWI727547B (en) * | 2019-12-12 | 2021-05-11 | 國立臺灣大學 | Noise Suppressor |
| TWI770488B (en) * | 2020-03-26 | 2022-07-11 | 創意電子股份有限公司 | Signal transmission device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5184045A (en) * | 1990-04-20 | 1993-02-02 | Goldstar Co., Ltd. | Magnetron for a microwave oven having a pair of choke coils wound around a core in the same directions |
| JPWO2004062220A1 (en) * | 2002-12-27 | 2006-05-18 | 松下電器産業株式会社 | Receiver |
| US7956704B1 (en) * | 2007-02-28 | 2011-06-07 | Pmc-Sierra Us, Inc. | Loaded parallel stub common mode filter for differential lines carrying high rate digital signals |
| JP4518103B2 (en) * | 2007-05-21 | 2010-08-04 | Ｔｄｋ株式会社 | Common mode choke coil |
| JP5073373B2 (en) * | 2007-06-08 | 2012-11-14 | Ｔｄｋ株式会社 | Common mode choke coil |
| JP4749482B2 (en) * | 2009-07-08 | 2011-08-17 | Ｔｄｋ株式会社 | Composite electronic components |
| CN103457252A (en) * | 2012-06-01 | 2013-12-18 | 富士康(昆山)电脑接插件有限公司 | Common-mode signal protective circuit and electric connector with same |
| CN103684024B (en) * | 2013-11-21 | 2016-04-27 | 浙江大学 | The inverter of a kind of times of streaming difference output |
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2014
- 2014-11-03 US US14/531,343 patent/US9577852B2/en active Active
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| Publication number | Publication date |
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| DE102015118829A1 (en) | 2016-05-04 |
| US9577852B2 (en) | 2017-02-21 |
| CN105577595A (en) | 2016-05-11 |
| KR20160052417A (en) | 2016-05-12 |
| US20160127157A1 (en) | 2016-05-05 |
| KR101735957B1 (en) | 2017-05-29 |
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